As Ash, launch a fireball, then quickly morph to Deep Blue and start shooting oil. The oil will be in flames as you shoot it. You will not take damage from the flames because Deep Blue is of the Water element and Fire doesn't affect it.
As Ash, launch a fireball, then quickly morph to Deep Blue and start shooting oil. The oil will be in flames as you shoot it. You will not take damage from the flames because Deep Blue is of the Water element and Fire doesn't affect it.